package sdk.webview.fmc.com.fmcsdk.util;

import android.content.Context;
import android.os.Environment;

import java.io.File;
import java.math.BigDecimal;

/**
 * Created by ydm on 2018/1/8.
 * 缓存清理管理类
 */

public class CacheDataManager {

    /**
     * 获取缓存大小
     * @param context
     * @return
     * @throws Exception
     */
    public static String getTotalCacheSize(Context context) throws Exception {
        long cacheSize = getFolderSize(context.getCacheDir());
        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
            cacheSize += getFolderSize(context.getExternalCacheDir());
        }

        return getFormatSize(cacheSize/2);

    }

    /**
     * 清除数据
     * @param context
     */
    public static void clearAllCache(Context context) {

        deleteDir(context.getCacheDir());

        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {

            deleteDir(context.getExternalCacheDir());

        }

    }

    /**
     * 删除缓存数据
     * @param dir
     * @return
     */
    private static boolean deleteDir(File dir) {

        if (dir != null && dir.isDirectory()) {

            String[] children = dir.list();

            for (int i = 0; i < children.length; i++) {

                boolean success = deleteDir(new File(dir, children[i]));

                if (!success) {

                    return false;

                }

            }

        }

        return dir.delete();

    }

// 获取文件

// Context.getExternalFilesDir() --> SDCard/Android/data/你的应用的包名/files/

// 目录，一般放一些长时间保存的数据

// Context.getExternalCacheDir() -->

// SDCard/Android/data/你的应用包名/cache/目录，一般存放临时缓存数据

    public static long getFolderSize(File file) throws Exception {

        long size = 0;

        try {

            File[] fileList = file.listFiles();

            for (int i = 0; i < fileList.length; i++) {

// 如果下面还有文件

                if (fileList[i].isDirectory()) {

                    size = size + getFolderSize(fileList[i]);

                } else {

                    size = size + fileList[i].length();

                }

            }

        } catch (Exception e) {

            e.printStackTrace();

        }

        return size;

    }

    /**
     * 格式化单位
     *
     * @param size
     */

    public static String getFormatSize(double size) {

        double kiloByte = size / 1024;

        if (kiloByte < 1) {
            return size + "B";
        }

        double megaByte = kiloByte / 1024;

        if (megaByte < 1) {

            BigDecimal result1 = new BigDecimal(Double.toString(kiloByte));

            return result1.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "KB";

        }

        double gigaByte = megaByte / 1024;

        if (gigaByte < 1) {

            BigDecimal result2 = new BigDecimal(Double.toString(megaByte));

            return result2.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "MB";

        }

        double teraBytes = gigaByte / 1024;

        if (teraBytes < 1) {

            BigDecimal result3 = new BigDecimal(Double.toString(gigaByte));

            return result3.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "GB";

        }

        BigDecimal result4 = new BigDecimal(teraBytes);
        return result4.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "TB";
    }

    public static void clearLubanCache(Context context) {
        // 获取内部缓存目录
        File internalCacheDir = context.getCacheDir();
        if (internalCacheDir != null) {
            deleteLubanCacheFiles(internalCacheDir);
        }

        // 获取外部缓存目录
        File externalCacheDir = context.getExternalCacheDir();
        if (externalCacheDir != null) {
            deleteLubanCacheFiles(externalCacheDir);
        }
    }

    private static void deleteLubanCacheFiles(File dir) {
        if (dir == null || !dir.exists()) return;

        for (File file : dir.listFiles()) {
            if (file.isDirectory()) {
                deleteLubanCacheFiles(file); // 递归删除子目录中的文件
            } else {
                // 假设 Luban 生成的文件名以 "luban_" 开头
                if (file.getName().contains(".jpg")) {
                    file.delete();
                }
            }
        }
    }
}






